Abstract
Summary: A number of new sections in Callovian and Lower Oxfordian strata were exposed on the western slope of the Hambleton Hills at Boltby Moor, near Thirsk, in 1967. The succession from the Upper Deltaic Series to the Lower Calcareous Grit is described and compared with other better known localities in Yorkshire. The Oxford Clay contained a prolific ammonite fauna at one horizon and proved to have the unexpectedly large thickness of about 35 metres.

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